Wiki-surgery? Internal validity of Wikipedia as a medical and surgical reference is an abstract about "the most commonly performed inpatient procedures in the U.S." on Wikipedia: the quality of its content in terms of comprehensiveness and reliability.

Two indepedent reviewers evalutated 39 procedures. 35 were indexed by Wikipedia and 30 of them were deemed appropriate. All presented accurate information, but only 22 had no critical omissions.
Risk were only discussed in 22 cases, while procedure indications in 34.

There was correlation between quality of Wikipedia articles and how often it was edited.